Rank Math is a WordPress SEO plugin by MyThemeShop with over 2 million installs since its 2018 launch. The free version is unlimited across sites with built-in Schema and Search Console integration; Pro starts at $59/year.
Google Search Console is Google's official free search performance monitoring tool, with data sourced directly from the Google Search index. Performance, Index Coverage, and Core Web Vitals reports cover the last 16 months of data and form the baseline data source for SEO.
SiteKit is Google's free WordPress data integration plugin, and 1 plugin can connect 5 key data sources to keep analysis and monetization in a single dashboard.
ContentKing is a real-time SEO content auditing and monitoring platform founded in the Netherlands in 2014, using continuous crawling to detect site changes within 10 minutes, with Google Search Console integration and Slack alerts.